Cane mill



F. FARREL. JR

CANE MILL Filed June 27, 1924 2 Sheets-Sheet 1 Patented Jan. 1

FRANKLIN FARREL, JR, OF NEW HAVEN,

CONNECTICUT, ASSIG-NOB, BY MESNE AS- SIGNMENTS, TO FARREL-BIRMINGHAM COMPANY, INCCEPQRATED, CF ANSONIA, CONNECTICUT, A CORPORATION 015 CONNECTICUT.

CANE

Applieatioufiled June 27,

This invention relates to cane grinding machinery, such as employed for the extraction of juice from sugar cane. In some of its aspects it is particularly applicable to mills having a plurality of pairs of socalled preliminary crushing rolls in front of one or more stands of juice expressing rolls.

One of the primary objects of my invention is to increase the efficiency of the grinding or crushing of the cane stalks.

Another object is to furnish a new roll tooth construction for preliminary crushers in which the relation of the longitudinal grooves to the circumferential grooves is such as to bring about a marked increase in the shredding and squeezing effect of the rolls of a given pair.

More specifically, the object is to increase to a marked degree the shredding and squeezing efiect of a succeeding pair of crusher rolls, i. e., a pair of such rolls that receives the cane from a preceding pair which may or may not be the first pair of preliminary crushing rolls.

To these and other ends, the invention consists in the novel features and combination of parts to be hereinafter described and claimed.

In the accompanying drawings;

Fig. 1 is a diagrammatic longitudinal section of a cane mill embodying my improve ments; 2

Fig. 2 is a top plan view of the preliminary crushing rolls;

Fig. 3 is an enlarged elevation showing the teeth of the crusher rolls of the first pair;

Fig. 4 is an enlarged horizontal section of portions of the crusher rolls of the first pair;

Fig. 5 is a view similar to Fig. 3 showing the teeth of the rolls of the second pair, and.

Fig. 6 is a view corresponding to Fig. 4 illustrating the tooth construction of the rolls of the second pair.

In the drawings it have illustrated a pair 2 MILL.

1924. Serial No. 722,749.

cane is drawn in and crushed by the rolls 10 so as to split open the stalks and separate the fibres to some extent, and is then carried over suitable inclined runways (not shown), to the second crusher 11, and the juice expressing mill 12. The latter may comprise the ordinary three-roll mill having the top roll 13, the cane roll 14, and the bagasse roll 15, and may or may not precede other similar juice expressing mills.

The rolls of the crushers 10 and 11 are pro vided with teeth for hooking or drawing in the cane so that the latter will be fed into and through the machine in a uniform and expeditious manner. In the embodiment shown, the rolls 10 are provided with a plurality of circumferential V-shaped grooves 16. This provides correspondingly shaped ridges or ribs, and the ribs of one roll of the pair enter to acertain extent the grooves of the other roll with a certain amount of clearance, as shown in Fig. 4. The circumferential grooves 16 are intersected by generally longitudinal grooves 17, the result of which intersection is the formation of the teeth 18, as shown in Figs. 3 and 4. Each of the longitudinal grooves 17 has an abrupt side 19, a sloping side 20, and a rounded bottom 21, as shown in Fig. 3. While the grooves 17 are longitudinal in a general sense, they are preferably not exactly parallel to the axis of the roll; in. fact, it is considered the best practice to provide an obtuse angle in the lengthwise groove at about the center of the roll, as shown in Fig. 2. I

In the second crusher 11, the grooving is substantially as follows: Teeth 22 are formed by the provision of circumferential and longitudinal grooves in generally the same manner described with reference to the rolls 10. The circumferential grooves of the second crusher are shown at 28 and the longitudinal grooves at 24. It will be noted, however, that whereas in the case of the rolls 10, the longitudinal and circumferential grooves are of substantially the same depth, the longitudinal grooves of the second crusher are of substantially less depth than the circumferential grooves thereof. In the first crusher, the circumferential grooves are, say, g g of an inch deeper thanthe longitudinal grooves in order to insure the scraper points of usual construction (not shown) reaching fully to the bottoms of the longitudinal grooves and thereby cleaning the same out thoroughly. In the second crusher, however, instead of having the longitudinal and circumferential grooves of substantially the same depth, the longitudinal grooves 24: should not nave more than three-quarters of the depth of the circum'li'erential grooves 28, and preferably less than that, and I believe that the bestresullis-are obtained by cutting the longitudinal grooves to a depth or approximately onethird-of that of the circumferential grooves, as shown in Figs. 5 and 6.

in the second crusher, owing to the condition of the cane as received tromthe first, less drawing or hoolringdn eliect is necessary. ()n theother hand, it is desirable to increase the shredding action and the juice expressing action. This is realized in my improved crusher by arranging the grooves in the manner described. Cane stalks supported in the shallow lengthwise grooves of a roll at a plurality of spaced points, are carried by a sort oi wiping motion down into relatively deep valleysof said roll by the circumferential ribs of the other roll. This so-called wiping'motion has the ellect of tearing apart the can stalks and shredding effectively and separatingthe fibres thereof, and at the same time the squeezing, orjuice eXpre -ig effect is increased by the fact that portions or? the stalk are forced or wedged down into the bottoms oft-he valleys, by and simultaneously with the wiping action! of the circumterential ribs;

By the grooving such as described in. connection with the rolls-11, there is obviously more metal provided than in a roll wherethe lengthwise grooves are deeper, and as the teeth aremore firmly anchored, and tied together longitudinally, the teeth are stronger and the construction very durable. Theshreddin and squcczi of the cane is so thoroughly performed as a result of the wiping m0- tion of tlio'roll teeth into and out of thebottoms of the lengthwise grooves of each roll and down into the relatively deep circumferential valleys, that a substantial increase in juiceextraction may be expected in a mill inwhich this feature is embodied.

It isapparent from the drawings that the rolls of the second pair are set closer together than those of the first pair.

I consider that thebest results are-obtained ina mill of this character where the pitch ofthe circumferential ribs of a preceding pair of crusher rollsis the same'asthe pitch of the circumferential ribs of a following pair, as shown inFig. 2-. Also, I regard it as preferable, in an installation such as de scribed, to have the spacing of the longitudinal. grooves 24. of the-following crusher the same as that of the longitudinal grooves 17 of the. preceding crusher. It will beapparent, however, that modifications in these respects may bemade withoutdeportingfrom theinvcntion. in certain of its aspects. It will be maniii'est also that while it is pre1terable to have the longitudinal grooves of the second pair of crusher rolls shallower than those of the first pair, I do not limit myself to a construction in whica the shallow lengthwise grooves are present in the second pair, but not in the first pair.

While I have shown and described a preferred embodiment of my invention, it is to be understood that it is not to be limited to the details shown but iscapable oimodification and variation within the scope of the appended claims.

Vihat I claim is:

1-. In: a cane mill, a'plurality of pairs of crushing rolls all having intersecting circumferential and longitudinal grooves,.the rolls of a. succeeding pair having the same number of longitudinal. grooves as the rolls or a preceding pair, and the longitudinal grooves of asucceeding pair being shallower than those of a preceding pair.

2. In a cane mill, a pair-of pro-crushing rolls havingintersecting circumferential and longitudinal grooves of substantially the same depth, and a secondpair of pre-crushing rolls having intersecting longitudinal and circumferential grooves whereof thecircumferential grooves are substantially deeper than the longitudinal grooves.

3. In a, cane mill, a pair of pre-crushing rolls havinginterseeting circumferential and longitudinal grooves of substantially the same depth, and a second pairot'pre-orushing rolls having similar? intersecting longitudinal and circumferentialgrooves whereof the circumferential grooves are substantially deeper than the longitudinal grooves, and the longitudinal grooves of the second pair being circumferentially spaced from each other: at the same distance as in; the first pair.

l. Ina cane milhtwo pairs of preliminary crushing rolls, each and all of; said rollshaving circumferential ribs of the. same pitch, and each and allot said rolls having lengthwise grooves of thesame spacing, the lengthwise grooves of the rollsol' the second pair being substantially shallower than those of the rolls of; the preceding pair.

5. In a canemill, a pair of preliminary crushing rollshaving intersecting circumferential and: longitudinal grooves of substantially the same depth, and a aair of following crushingrolls having intersecting circumferential, and longitudinal grooves,.the pitch of the circumferential grooves of rolls of both pairs being the same as well as the spacing of the longitudinal grooves, but the deptltof the longitudinal grooves of the second pair of rolls being less than half the depth of the circumferential grooves of said rolls.

6. In a canemill, two pairs of preliminary crushing rolls having circumferential ribs of the same pitch and longitudinal grooves of the same spacing, the longitudinal grooves of the second pair of rolls being substantially shallower than the circumferential grooves of said pair and substantially shallower than the longitudinal grooves of the first pair.

7. In a cane Inill, tWopairs'of crushing rolls arranged in tandem, the first of said pairs of rolls having intersecting circumferential and longitudinal grooves of substantially the same depth and the succeeding or second of said pairs of rolls having intersectwhereof the circumferential grooves are sub- 7 stantially deeper than the longitudinal grooves whereby the rolls of the succeeding pair have less of their shredding surfaces deleted by the longitudinal grooves and there fore greater cooperating shredding surfaces han the rolls of the preceding pair.

In Witness whereof, I have hereunto set my hand this 25th day of June, 1924:.

FRANKLIN FARREL, JR. 

